@JoeSalmonBmouth Recently gave our 9yo a phone with a SIM card because, depending on scheduling, sometimes we're cutting it close when picking him up from his activities... Suspect we're not far off the WhatsApp request ourselves.
@JoeSalmonBmouth WhatsApp is end-to-end encrypted so more of a problem. You _could_ allow them to use it on the condition that you can review usage on request, or on the condition that they allow you to sign into their WhatApp through the web browser to monitor like that.